Communication Systems - BPSK - Signal Constellations

clear all;
clc ;
close ;
M =2;
i = 1:M;
y = cos (2* %pi +(i -1)* %pi);
annot = dec2bin ([length(y)-1: -1:0] ,log2(M));
disp (y, ' coordinates of message points ' )
disp (annot , 'Message points ' )
figure ;
a = gca ();
a.data_bounds = [ -2 , -2;2 ,2];
a.x_location = "origin";
a.y_location = "origin";
plot2d (real (y (1) ),imag (y (1) ) ,-9)
plot2d (real (y (2) ),imag (y (2) ) ,-5)
xlabel ('In-Phase');
ylabel ('Quadrature');
title (' Constellation for BPSK') 

legend ([ ' message point 1 ( binary 1) ' ; ' message point 2 ( binary 0) '] ,5)